/Engine/Source/Runtime/Engine/Classes/Kismet/KismetInternationalizationLibrary.h
Get the list of cultures that have localization data available for them.
The list of cultures as IETF language tags (eg, "zh-Hans-CN").
static [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > GetLocalizedCultures ( const ELocalizationLoadFlags LoadFlags )